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She had previously turned to drugs, then prostitution to fund her habit, following the death of her sister.

The Crown Office asked Police Scotland to reinvestigate the unsolved case in 2015 after the original investigation failed to bring the killer to justice.

Ms Caldwell's mother Margaret Caldwell, uncle Jim Coyle and family solicitor Aamer Anwar met with Scotland's top prosecutor, Lord Advocate James Wolffe QC, on Thursday to voice frustration over the length of time the current investigation is taking.

The funeral of Emma Caldwell is held at Elim Church (Image: Media Scotland)

Speaking afterwards on the family's behalf, Mr Anwar said they wanted to talk directly to the killer.

He said: "Eleven years ago when you took Emma's life, you tore apart her family's lives forever. They were unable to bury Emma for some two years, her mother Margaret has never been able to grieve, and when William, Emma's father, died from cancer in 2011, he made his family promise they would never give up fighting for justice.